Abstract: The F₁,F₂ and B₁F₁ plants derived from the crosses of susceptible cultivar,Er-Jiu-Qing,with four resistant cultivars were artificially inoculated with four fungus strains (Pyricularia oryzae)respectively,and the resistant reactions of these populations were investigated.The results indicated that the resistance of cultivars,Hong-Jiao-Zuan,Chai-Tang,Tetep,745461-BG to strains ZB1,ZB15,ZC15,ZC3 are respectively governed by dominant genes,Ipi-1,Ipi-2,Ipi-3 and Ipi-4,and that these genes are closely linked. It was shown that the resistant genes in the cultivars are all allelic.

Key words: indica rice, rice blast, resistance, genetic analysis

摘要： 用感稻瘟病品种二九青与4个抗病品种杂交的 F₁、F₂、B₁F₁经4个不同菌系的稻瘟病菌孢子悬浮液分别进行人工接种,然后考查其抗性反应。结果表明红脚占、砦糖、Tetep 和74-5461BG 等籼稻品种对 ZB1、ZB15、ZC15、ZC3菌系的抗性均分别由显性抗性基因 Ipi-1、Ipi-2、Ipi-3和 Ipi-4控制,同时这4个抗性基因还存在着紧密的连锁关系。等位性测定也表明4个品种所具有的抗性基因都是各各等位的。

关键词: 籼稻, 稻瘟病, 抗性, 遗传分析